The designer bares all in an ad celebrating the show's July 28 debut

By Kate Hogan
Updated June 24, 2011 07:00 PM

Courtesy Lifetime

In a revealing new ad for the upcoming season of
Project Runway
, Heidi Klum leaves little to the imagination. “This is definitely sexier than past campaigns we’ve done,” she tells PEOPLE. “I guess you could say ‘Hans and Franz’ are celebrating season 9.” The new season, which premieres July 28 (9 p.m. ET) on Lifetime, features Klum and her trusty co-judges Michael Kors and Nina Garcia, plus mentor Tim Gunn and a bevy of celebrity judges, including Kim Kardashian, Christina Ricci, Zoe Saldana and Malin Akerman. Read more in our TV Watch section.